From fbb9c3c9a5acfdbcc21114de0ba16c7b488968f6 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 21 Mar 2019 10:01:10 +0100 Subject: PM / devfreq: exynos-bus: Suspend all devices on system shutdown Force all Exynos buses to safe operation points before doing the system reboot operation. There are board on which some aggressive power saving operation points are behind the capabilities of the bootloader to properly reset the hardware and boot the board. This way one can avoid board crash early after reboot. This fixes reboot issue on OdroidU3 board both with eMMC and SD boot. Reported-by: Markus Reichl Signed-off-by: Marek Szyprowski Acked-by: Chanwoo Choi Signed-off-by: MyungJoo Ham --- drivers/devfreq/exynos-bus.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c index c25658b26598..486cc5b422f1 100644 --- a/drivers/devfreq/exynos-bus.c +++ b/drivers/devfreq/exynos-bus.c @@ -514,6 +514,13 @@ err: return ret; } +static void exynos_bus_shutdown(struct platform_device *pdev) +{ + struct exynos_bus *bus = dev_get_drvdata(&pdev->dev); + + devfreq_suspend_device(bus->devfreq); +} + #ifdef CONFIG_PM_SLEEP static int exynos_bus_resume(struct device *dev) { @@ -556,6 +563,7 @@ MODULE_DEVICE_TABLE(of, exynos_bus_of_match); static struct platform_driver exynos_bus_platdrv = { .probe = exynos_bus_probe, + .shutdown = exynos_bus_shutdown, .driver = { .name = "exynos-bus", .pm = &exynos_bus_pm, -- cgit v1.2.3